I heard the story behind the Whiskey Bottle Tombstone of William T. Mullen, exactly as you describe it. I took a photo when we visited it in 2002, in a small cemetery in Clayton, just outside of Eufaula.

An unusual granite sculpture marks the Clayton Cemetery burial spot of William T. Mullen, who died in 1863. The tale behind the whiskey bottle-shaped gravestone is that Mullen's wife followed through on a threat of posthumous humiliation if he didn't stop drinking. He didn't.